@@ -26,10 +26,11 @@
  *	  it when it gets deallocated.
  *
  * @note Secure memory might be unavailable on the platform, in which case this
  *	 falls back to insecure (potentially swappable) memory.
  */
+OF_SUBCLASSING_RESTRICTED
 @interface OFSecureData: OFData
 {
 	struct page *_page;
 }